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I was rather surprised to see a 60k change interval on an iridium plug. I just pulled out the FACTORY NGK double platinums out of my buddies G35x today. .088" gap is what we found with 160k miles on the odometer. Never missed a beat though. He just decided to change them to make sure, because the car was bought used about a year ago.
I would have thought they would use a 100k service plug at minimum, just because they're hard to get to.
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